STUDY ON ADSORPTION PROPERTIES OF ACID-TREATED PALYGORSKITE CLAYS FOR Cd²⁺

In this paper,the effects of palygorskite clay with acid-treated of different HCl concentrations on adsorption properties for Cd²⁺ were investigated.On this base,the effects of concentration of Cd²⁺ solution,pH value of adsorption solution and amount clay on adsorption properties of acid-treated palygorskite clay for Cd²⁺ were studied.The results show that adsorption capacities of acid-treated palygorskite clay for Cd²⁺ increase with increasing HCl concentration.In the conditions of amount of palygorskite clay is 0.15g,adsorption time is 3h,pH value of initial adsorption solution is 8.50 and Cd²⁺ concentration of adsorption solution is 500mg/L,the adsorption capacity of 12mol/L HCI treated palygorskite clay for Cd²⁺ reach 86.24%.The adsorptions of Cd²⁺ on palygorskite clay were fitted to both Langmuir and Freundlich models.